Calibration sharing for CMOS output driver

Details Calibration sharing for CMOS output driver Calibration sharing for CMOS output driver

1998-07-31

2000-05-16

Tokar, Michael

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

326 86, 326 82, H03K 1716, H03K 19003

Patent

active

060642246

ABSTRACT:
A circuit for matching the impedance of a first array of transistors to an external resistor is used to produce a first set of control signals. This first set of control signals is used to control another array of transistors to replicate the impedance of the first array of transistors. This replicated impedance is then used by another circuit for matching impedance to produce a second set of control signals that control an array of transistor of a different type to match the impedance of the first two array. The two sets of control signals may then be used as calibration signals for the pull-up and pull-down transistors of multiple output drivers.

REFERENCES:
patent: 5254883 (1993-10-01), Horowitz et al.
patent: 5844913 (1998-12-01), Hassoun et al.

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